一、Flink SQL Deduplication 特性高效去重：Flink SQL 的 Deduplication 操作能够快速有效地去除重复数据，确保数据的唯一性。无论是在流处理还是批处理场景下，都能高效地完成去重任务。支持多种数据类型：可以对各种数据类型进行去重操作，包括整数、字符串、日期等。这使得它在处理不同类型的数据时具有很高的灵活性。可配...

问答 2023-09-05 来自：开发者社区

Flink如果是 SELECT COUNTflink sql 如何去重？如果不把之前的存储下来，是如

Flink如果是 SELECT COUNT( DISTINCT orderId) FROM source_table；比较好奇，如果第一条数据的 orderId是 A00023，然后kafka推送到第 70W，条数据的orderId 也是 A00023，flink sql 如何去重？如果不把之前的存储下来，是如何做到过滤掉 A00023 这个重复 orderId的？

问答 2022-08-30 来自：开发者社区

请问flink sql里面统计窗口内的数据的时候，想去重取最新状态，应该怎么做

问答 2022-07-28 来自：开发者社区

flink sql topN去重 (row_number =1 )有没有调优参数，同样的执行语句和服

flink sql topN去重 (row_number =1 )有没有调优参数，同样的执行语句和服务器配置（都是基于hive表做的去重），发现Spark SQL的执行速度快一倍以上。是不是哪些优化参数没调整到位？

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更新时间 2024-12-18 08:40:35

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实时计算Flink版

阿里云实时计算Flink版(Alibaba Cloud Realtime Compute)，完全兼容开源的Apache Flink，比开源性能提升2～3倍，提供了完整的告警、监控、日志的解决方案、提升开发效率且无运维成本，并有社区专家提供技术支持。

立即开通

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产品文档

实时同步

MySQL 到 Hologres

Kafka 到 Hologres

功能对比

开源Flink对比

成本优化

作业自动调优